incunabula

The cradle or early abode; the place in which a thing had its earliest development, as a race, an art, etc.; hence, first trace; beginning; origin.

In ornithology, a breeding-place; the resort of a bird to breed.

In bibliography, books printed in the infancy of the art; generally, books printed before the year 1500: in this sense rarely with a singular incunabulum.

noun

Plural form of incunabulum.